Comment 3 for bug 521722

> There are no "maintainer defaults" here. There is nothing stored within the source package that identifies which component should be used:

That's not exactly true - the uploader will have specified a component in the changes file. While not strictly in the source itself, it's still data supplied to Soyuz, it doesn't exist "solely within Soyuz."

The information you want is on each series presented on that page. The most sensible solution is to remove the Component completely from the top section, since the component could be different depending on which series you're uploading to.